Magnetic properties indicate the sources of hadal sediments in the Yap Trench,northwest Pacific Ocean  

作　　者：CHEN Yu YANG Jichao DADA Olusegun A YANG Yaomin LIN Zhen CUI Zhen XU Yue YU Hongjun LIU Baohua 

机构地区：[1]Institute of Deep Sea Science and Engineering,Chinese Academy of Science,Sanya 572000,China [2]National Deep Sea Center,Ministry of Natural Resources(MNR),Qingdao 266237,China [3]Dept.of Marine Science&Technology,Federal University of Technology,Akure 340252,Nigeria [4]University of Chinese Academy of Science,Beijing 100049,China

出　　处：《Journal of Oceanology and Limnology》2020年第3期665-678,共14页海洋湖沼学报（英文）

基　　金：Supported by the National Basic Research Program of China(973 Program)(No.2015CB755901);Taishan Scholar Project Funding(No.tspd2016007);13 th Five-Year Plan Program of the China Ocean Mineral Resources Research and Development Association Research(No.DY135-S2-2-08);China Postdoctoral Science Foundation(No.2017M610403);the National Key R&D Program of China(Nos.2018YFC0309802,2018YFC0309903)。

摘　　要：Magnetic minerals in marine sediments are often masked by the primary natural remanent magnetization and material source signals.In order to understand sedimentary environment and sources of sediments in the abyss,we studied 126 samples of five bottom surface cores collected by the Jiaolong Submersible at 4000-7000 m in depth during the third stage of the China's 38th Ocean Voyage.The magnetic properties of the sediments were analyzed using Thermosusceptibility(k-T)curves and Day plot.The results show that the magnetic minerals in the sediments of the Yap Trench are mainly maghemite,and the overall magnetic and soft magnetic properties were strong.The magnetic particles of sediments are dominated by pseudo single domains(PSD)grains.The main source of sediment is locally-derived basalt debris and volcanic debris,and the process of sedimentation is gravity-like flow deposition.

关 键 词：magnetic property material RESOURCE hadal SEDIMENT Yap TRENCH 

分 类 号：P736.21[天文地球—海洋地质]